Paint and varnishes study

1. Paint AND VARNISHES
OF WOOD
BY:-MADHUKANT SINGH

2. PURPOSE OF A FINISHPURPOSE OF FINISH
 PROTECT THE WOOD FROME WEAR AND TEAR
 PREVENTS DECAY – FUNGUS , INSECTS
 PROVIDES A NICE FINISHED SURFACE
 ENHANCES COLOUR
 CHANGES THE COLOUR (STAINING)

3. SURFACE
PREPARATION
• GETTING THE SURFACES
SMOOTH AND CLEAN
• PREPARING THE PIECE
BEFORE PUTTING ON THE
FINISH
APPLICATION
OF FINISH
• THE STEPS IN PUTTING ON
THE DIFFERENT LAYERS OF
CHOSEN FINISH
• DIFFERENT FINISHES WILL
HAVE SLIGHTLY DIFFERENT
STEPS
FINISHING STAGES

4. SURFACE FINISH
 RUB OUT/REMOVE PENCIL LINES
 SCRATCHES AND MARKS CAN BE
REMOVWD USING SCRAPER
 PUNCH NAILS AND PIN BELOW
SURFACE
 FILL NAIL AND SMALL CRACKS USING
A SUITABLE WOOD FILLER
 SAND THE SURFACES SMOOTH
USING SANDPAPER
 SAND END GRAIN
 START WITH 100GRIT(MEDIUM)
SANDPAPER, THEN WITH 180 GRIT
AND FINALLY 320 GRIT(VERY FINE)
 ALWAYS SAND WITH THE GRAIN –
AVOID SCRATCHING THE SURFACE
 BRUSH OFF ALL DUST OR USE A TRCK
CLOTH

5. Sandpaper (glass paper)
• Composition of
sandpaper
-Grit in bonded to
the backing paper or card
-The grit size is
printed on the back of
the sandpaper

6. Sanding
Always sand with the grain
Always sand with the grain

7. Paint
Advantages
• good inside and outside
• Lots of colour available
• Durable
• Long-lasting
• Easily-cleaned
• Covers scratches and defects
well
Disadvantages
• Hides the beauty of wood
• Difficult to apply well
• Needs good preparation
• Can blister and peel

8. PAINTING WOOD
• Prepare surface well
• Seal knots with knotting
• Apply primer to all surface
• Fill cracks and holes
• Apply 1-2 coats of
undercoat
• Sand lightly
• Apply final finish coat
• Allow each coat to dry fully

9. VARNISH
WHY CHOOSE VARNISH?
• Water resistant
• Scratch resistant
• Easily cleaned
• Clean finish enhances
the grain of wood
• Resists heat
• Stains/coloured varnish
are available

10. Microporous finishes
• Breathable skin
• Protect the wood from the
weather
• Allow moisture to
evaporate from the wood
• Do not flake or blister
• Enviromentally friendly
• For external use, e.g.-
sheds/fences

11. Danish oil
WHY CHOOSE DANISH OIL?
• Easy to apply
• Doesn’t raise the grain
• Gives nice shine
• Wood can be re-oiled
• Suitable for outdoor use

12. Wax finishes
WHY CHOOSE WAX?
• Easy to apply
• Does not raise the grain
• Gives nice lustre/shine
• Easy to renew
• Allows the polish to be built
up
• No sanding between coats
• Indoor use only

13. lacquer
• Applied by spraying
• Special equipment is
required
• Proper extraction
system is requires
• Lacquer is harmful if
inhaled